Catholics eat fish on Fridays because it is a tradition to avoid eating meat on that day, especially to remember Jesus Christ crucifixion, which happened on a Friday. By not eating meat, they show respect for Jesus’s sacrifice and follow teachings about being thankful and sorry for mistakes. Fish is eaten instead because it symbolizes victory over death, like how Jesus triumphed over death by coming back to life. This tradition helps Catholics remember Jesus’s sacrifice and victory, encouraging them to think about their own spiritual beliefs and showing support for people who are struggling.